Four thousand weeks is roughly the number of weeks you’ll have if you live to about 80. Although the book’s subtitle is “Time management for mortals”, it’s not really about time management (in the conventional sense). Rather, it’s about values and priorities and making the most of our limited time on this earth.
The 48 Laws of Power is written like a “how to” book, but should not be read as such. If read that way, it’s a terrible book. Not only does it encourage you to be an awful person, it doesn’t give much guidance on how to apply the laws in practice.